The third way: caisson type. This method is also the most commonly used method for bathroom decoration at present. The floor slab of the bathroom is lowered by 300 to 400 mm, the drain pipe will be spread along the ground, and connected to the riser, and then a decorative layer will be added to the pipe. The ground height is basically the same as that of the living room, and the sanitary ware will also be drained. The floor drain is about to use the drainage method, which is also very flexible. The fourth way: buried pipes in the structural layer. This method adopts the same-layer drainage method, and the sanitary ware will be installed according to the pipeline design, and the same-layer drainage structure will not affect other residents. This method requires special design, so most people rarely use this method. The floor drain arrangement will be relatively limited, so there is no guarantee of a suitable water seal depth.
